| 摘要 |
<p>The present invention relates to a flux gate type non-contact current measuring device for measuring a measured current by detecting an electromagnetic field around wires in which the measured current flows and to a flux type non-contact measuring device for detecting a DC component by a change in an oscillating signal after applying the oscillating signal to magnetize two cores with opposite polarity to each other; detecting the DC component by forming an LC oscillation circuit using the inductance of a coil wound around one core and applying the LC-oscillating signal to a coil wound around the other core; detecting an AC component by using the other core; measuring the measured current by the measurement of a compensation current in the state that the compensation current corresponding to the detected DC and AC components converges on a condition of canceling a magnetic flux caused by the measured current; and normally measuring the current by automatically demagnetizing the LC oscillating core even when the LC oscillating core is saturated by the measured current. [Reference numerals] (10) Oscillating unit;(20) Compensation current generating unit;(30) Saturation recovery unit;(AA) Compensation current;(BB) Detection unit</p> |
